Tengu format ruling
Ultimate Insect LV3
Card effect (current official text)If this card was Special Summoned by the effect of "Ultimate Insect LV1", while it remains on the field all of your opponent's monsters lose 300 ATK. During your Standby Phase, by sending this face-up card to the Graveyard, Special Summon 1 "Ultimate Insect LV5" from your hand or Deck. (You cannot activate this effect the turn this card is Normal Summoned, Special Summoned, or flipped face-up.)
Rulings
- The effect of Ultimate Insect LV3 that reduces ATK by 300 points is a Continuous Effect that is applied as long as the monster remains face-up on the field and is applied as soon as it is face-up on the field.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.